[parisc-linux] Power LED

[Hinrich Aue]

Am Montag, 18. Februar 2002 12:49 schrieben Sie:
> On Monday 18 February 2002 11:15, Hinrich Aue wrote:
> > ------------------------------------------
> >
> > >715/64, 715/80 and 715/100 belong to the so-called
> > >715/new machines and all of those support the
> >
> > soft-power
> >
> > >switch, else you wouldn't have received the
> > >"Shutdown requested..." message.
> > >In your case I assume, that your filesystems wasn't
> >
> > clean
> >
> > >before you did shutdown your system....
> > >
> > >BTW, the shutdown is initiated by the kernel by
> >
> > sending
> >
> > >a SIGINT to the PID (cad_pid) of the init process.
> >
> > This
> >
> > >is done in the file power.c:
> > >http://cvs.parisc-linux.org/linux/arch/parisc/kernel/power.c?rev=1.5&con
> > >te nt-type=text/vnd.viewcvs-markup After receiving this signal the init
> > > process switches
> > >the runlevel,
> > >shuts down your system cleanly and runs
> >
> > /sbin/poweroff
> >
> > >or /sbin/halt. This is already the case and is also
> > >done
> > >that way for ATX systems.
> > >
> > >Regards,
> > >Helge
> >
> > But if I push the power button, the init process
> > doesn't seem do change the runlevel, and power off
> > immediatly.
> > I can see the message "Shutdown requested..." and then
> > - power off -.
> > I think this souldn't be so.
>
> Yes, that's wrong. But you seem to be the only one
> who has such problems with 715/new. As I said in another

Why me?????
That's strange behavior.

> mail my Scorpio (715/50) machine shuts down immediately too -
> but this machine doesn't support the soft-power switch either.
> BTW, which kernel are you using ?

I use 2.4.17-pa26

>
> > Also I think it is a bit dangerous if everyone can
> > switch of the system, clean or unclean, just by
> > pushing the button.
>
> That's right, but that's also the behaviour on Non-ATX PC's.
>
> > Maybe a 5 second push-time would be good (like ATX)
> > but with a gracefull shutdown.
>
> That's not that easy.
> On some systems the switch will send a key-down signal from
> the first press on, independantly if you released the button again or
> not. Other machines just send the signal while the button
> is down and stops it again if it was released.
>
> That said, this is how I wrote the code.
> In process_shutdown() you'll find:
>        /* wait until the button was pressed for 1 second */
>         if (shutdown_timer == HZ) {
>                 static char msg[] = "Shutting down...";
> 	    printk(KERN_INFO "%s\n", msg);
>
> This means, that the kernel will just shutdown, if you pressed
> the button for at least 1 second. You might change that to 5*HZ if
> you want the 5 second push-time.
> But, as I said, the kernel can't recognize on some systems if
> you have released the button again and so it will always
> time-out and initiate the shutdown request. Your 715/80 seems
> to fall into this category of systems.
>
> Regards,
> Helge

Hinrich